The Talking Machine Forum — For All Antique Phonographs & Recordings

Has anyone ever seen something like this before? Is it legit reproducer tool, or something else? How exactly does it work?

https://www.ebay.com/itm/phonograph-rep ... SwrNBftCpk

It appears that you could clamp an Edison C, H, K reproducer body in it and use the special wrench to screw/unscrew the retaining ring. That was my take on it anyway. Appears to be very nicely made!